Abstract: A power meter for power a pedal and crank arm based drive mechanism measures and displays athletic performance information as a measure of a physical quantity, power, using a flexible force sensor inserted into a cycling shoe. Mathematical cycling models and data from the flexible force sensor are used to calculate the power.

Abstract: A pressure bulkhead especially for closing the tail end of the pressurized interior of an aircraft fuselage includes a curved or cupped disk, a peripheral rim, and a transition portion joining the rim to the disk. All the components of the bulkhead are integrally formed of a fiber-reinforced composite material. The peripheral rim and the transition portion together form a circumferential frame that supports circumferential forces and transfers forces into the aircraft fuselage, to which the rim is connected. The transition portion has a curved cross-section that curves in the opposite direction relative to the curvature of the cupped disk, whereby the rim bends or flares back toward the convex side of the cupped disk. The curvature of the transition portion is relatively tight so that an acute angle is formed between the rim and the cupped disk, and the rim extends in contact with the inner surface of the fuselage structure over a contact range at which the rim may be rivet-connected to the fuselage.

Abstract: An aircraft structure, such as a wing, is made of fiber composite material and includes a shell structural component also made of fiber composite material. The structural component has at least one access opening closeable by a cover. The shell structural component has a first area containing the access opening closeable by the cover. In the longitudinal direction of the wing the first area is predominantly flexible while a second area surrounding the first area is predominantly stiff, whereby these areas take up different longitudinally effective forces, relative to the length of the wing. Both areas are capable of transferring shear forces in the same manner.